十二题分组分解法(1) m²+3m-mn-3n (2)x²-a²-2x+2a(3) x²+y²+2xy+ax+ay (4) (m+n)²-3(m+n)+2(5) 3a-6b-a²+4ab-4b² (6) (p-q)²-(q-p)-20(7) x²+(2y-1)x+y(y-1)(8) 若x²-kx-15=(x+5)(X-3),则k=?(9) 若x
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十二题分组分解法(1) m²+3m-mn-3n (2)x²-a²-2x+2a(3) x²+y²+2xy+ax+ay (4) (m+n)²-3(m+n)+2(5) 3a-6b-a²+4ab-4b² (6) (p-q)²-(q-p)-20(7) x²+(2y-1)x+y(y-1)(8) 若x²-kx-15=(x+5)(X-3),则k=?(9) 若x
十二题分组分解法
(1) m²+3m-mn-3n (2)x²-a²-2x+2a
(3) x²+y²+2xy+ax+ay (4) (m+n)²-3(m+n)+2
(5) 3a-6b-a²+4ab-4b² (6) (p-q)²-(q-p)-20
(7) x²+(2y-1)x+y(y-1)
(8) 若x²-kx-15=(x+5)(X-3),则k=?
(9) 若x²+Ax+B=(x-3)(x-4),则A=?,B=?
(10) (a+b)²+5(a+b)-36
(11) (2x-3)²+3(2x-3)+2
(12) -3(x-1)²y²+11(x-1)y²-6y²
十二题分组分解法(1) m²+3m-mn-3n (2)x²-a²-2x+2a(3) x²+y²+2xy+ax+ay (4) (m+n)²-3(m+n)+2(5) 3a-6b-a²+4ab-4b² (6) (p-q)²-(q-p)-20(7) x²+(2y-1)x+y(y-1)(8) 若x²-kx-15=(x+5)(X-3),则k=?(9) 若x
1.（m+3)*(m-n) 2.(x-a)*(x+a-2) 3.(x+y)*（x+y+a)
4.(m+n-2)*(m+n-1) 5.(a-2b)*(3-a+2b) 6.(p-q+5)*(p-q-4)
7.(x+y)*(x+y-1) 8.k=-2 9.A=7 B=12 10.(a+b+9)*(a+b-4)
11.(2x-1)*(2x-2) 12.(3x-5)*(4-x) *y²
注：*为乘号
1.m(m+3)-n(m+3)=(m+3)(m-n)
2.(x+a)(x-a)-2(x-a)=(x-a)(x+a-2)
3.(x+y)^2+a(x+y)=(x+y)(x+y+a)
4.(m+n-1)(m+n-2)
5.3(a-2b)-(a-2b)^2=(a-2b)(3-a+2b)
6.(p-q+4)(p-q-5)
7.x^2+2xy-x+y^2-y=(x+y)^2-(x+y)=(x+y)(x+y-2)
9.A=7,B=12
第八题K=-2，第九题A=-7，B=12